Self-organized systems for measuring surface stress at the nanoscale: N and O adsorption on Cu(001)
- Institut des NanoSciences de Paris, UMR CNRS 7588, Universite Pierre et Marie Curie-Paris 6, Universite Paris 7, 140, rue de Lourmel, 75015 Paris (France)
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, Boite Postale 48, 91192 Gif sur Yvette Cedex (France)
- Materiaux et Phenomenes Quantiques, Universite Paris 7, 2, place Jussieu, 75005 Paris (France)
We have studied, by grazing incidence x-ray diffraction, the surface stress variation under nitrogen and oxygen adsorption on Cu(001), exploiting the nitrogen self-organization on Cu(001). The measured structure factors are analyzed in the framework of linear elasticity theory. This allows us to calculate the elastic displacements in the bulk from the surface stress discontinuities located at the domain boundaries between the different phases that are present at the surface. We find that the variations of surface stress upon adsorption are of the order of 5.5 Nm{sup -1} for the N/Cu(001)-c(2x2) structure and 1.2 Nm{sup -1} for O/Cu(001)-c(2x2) structure. For both cases, elastic interactions due to surface stress variations are higher than electrostatic interactions. In addition, we have precisely determined the atomic structure of the c(2x2) N/Cu(001) and O/Cu(001) (2{radical}(2)x{radical}(2))R45 deg. structures, showing that there is no significant Cu buckling in the c(2x2) N/Cu(001) case.
- OSTI ID:
- 20788193
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 20; Other Information: DOI: 10.1103/PhysRevB.73.205418; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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